21004213033 has 2 divisors, whose sum is σ = 21004213034. Its totient is φ = 21004213032.

The previous prime is 21004213007. The next prime is 21004213037. The reversal of 21004213033 is 33031240012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20951983504 + 52229529 = 144748^2 + 7227^2 .

It is a cyclic number.

It is not a de Polignac number, because 21004213033 - 2⁵ = 21004213001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004213033.

It is not a weakly prime, because it can be changed into another prime (21004213037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502106516 + 10502106517.

It is an arithmetic number, because the mean of its divisors is an integer number (10502106517).

Almost surely, 2^21004213033 is an apocalyptic number.

It is an amenable number.

21004213033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004213033 is an equidigital number, since it uses as much as digits as its factorization.

21004213033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21004213033 its reverse (33031240012), we get a palindrome (54035453045).

The spelling of 21004213033 in words is "twenty-one billion, four million, two hundred thirteen thousand, thirty-three".